Sample Files
Details
JSON
JavaScript Object Notation
About
What is .JSON?
.json is a text-based format used for representing structured data as key–value pairs and arrays. It is widely used in APIs, configuration files, databases, web applications, and data exchange due to its readability and compatibility with nearly all programming languages.
History
Origin of JSON
JSON (JavaScript Object Notation) was created by Douglas Crockford in the early 2000s as a lightweight, language-independent data interchange format derived from the syntax of JavaScript. Although based on JavaScript object literals, JSON became widely adopted across programming languages due to its simplicity and ease of parsing. In 2013, JSON was standardized as ECMA-404 and later documented in RFC 8259. JSON is now the dominant format for APIs, configuration files, data serialization, and web communication.
Learn more at: https://www.ecma-international.org/
Benefits
Lightweight and easy to read/write for both humans and machines
Supported by virtually all programming languages
Ideal for API communication and data interchange
Simple structure with objects, arrays, strings, numbers, booleans, and null
Faster and less verbose compared to XML
Well-suited for configuration files and structured data storage
Usage
Open `.json` files in any text editor or IDE with syntax highlighting
Parse or serialize JSON using languages like JavaScript, Python, Java, C#, or Go
Use JSON for web APIs, microservices, and data transfer
Store configuration files in JSON format for applications and frameworks
Convert JSON to CSV, XML, YAML, or other formats using command-line tools and libraries
Use Cases
Common Use Cases
Here are the use cases for this file extension
APIs & Web Services
Most modern APIs return JSON for efficient and structured data communication.
Configuration Files
Applications, frameworks, and tools often store settings in JSON (e.g., package.json, config.json).
Databases & Serialization
NoSQL databases such as MongoDB, CouchDB, and Firebase use JSON-like structures to store data.
Compatibility
Supported By
This extension is compatible with the following platforms.
Windows
macOS
Linux
Android
iOS
Web Browsers (native JSON support)
More Details
Technical Specs
Here are some technical details about this extension
File Extension
.json
MIME Type
application/json
Encoding
UTF-8 (recommended), UTF-16, UTF-32
Structure
Objects (key–value pairs), arrays, numbers, strings, booleans, null
Schema Support
JSON Schema (for validation and structure definition)
Metadata Support
No built-in metadata fields (customizable )
Typical Use
APIs, data storage, configuration files, serialization
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Got Questions?
Get answers to common questions
JSON is lightweight, human-readable, and maps naturally to programming-language data structures. It is standardized under ECMA-404 and widely used in REST APIs and web services.
JSON can be validated using JSON Schema or tools built into many programming languages and IDEs. Validators ensure structure, types, and required fields are correct.